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Pandas DataFrame Selection Quiz

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Questions and Answers

What method is used to select the top 2 records from a DataFrame?

select_head()

select_top()

head() (correct)

first_records()

How would you select records where the 'age' is greater than 18 in a DataFrame?

select_records(df.age, >, 18)

filter.df(age > 18)

df.select_age(>18)

df[df.age > 18] (correct)

What function is used to add a new column in a DataFrame that sums values across specific columns?

sum(axis=1) (correct)

calculate.sum()

total_values()

add_column(sum)

Which method is used for sorting records in a DataFrame based on a specific column?

sort_values() Signup and view all the answers

How would you read a CSV file into a DataFrame using pandas?

pd.read_csv('file_name.csv') Signup and view all the answers

Which SQL query would you use to display student details who got the highest total marks?

'select * from tableName order by totalMarks desc limit 1' Signup and view all the answers

What action will the trigger 'trigger_name' perform?

Abort the insertion if the email is not ending with '@gmail.com' Signup and view all the answers

In the 'Student' table, what does the primary key 'sno' represent?

Student's unique identification number Signup and view all the answers

What is the purpose of using the SELECT statement in SQL?

To retrieve data from a table Signup and view all the answers

What will the Python program do when listing out the top three records from a dataframe?

Display the first three records in the dataframe Signup and view all the answers

What does the 'gross_salary' column represent in the 'Employee' table?

The total amount earned by an employee before deductions Signup and view all the answers

When sorting a dataframe based on 'gross salary', what will be the impact on the order of records?

Records will be sorted in ascending order based on 'Ename' Signup and view all the answers

Study Notes

Data Manipulation with Pandas

To select the top 2 records from a DataFrame, use the head() function.
To select records where the 'age' is greater than 18 in a DataFrame, use the conditional selection method df[df['age'] > 18].
To add a new column in a DataFrame that sums values across specific columns, use the assign() function.
To sort records in a DataFrame based on a specific column, use the sort_values() method.

Reading CSV Files with Pandas

To read a CSV file into a DataFrame using pandas, use the read_csv() function.

SQL Queries

To display student details who got the highest total marks, use the SQL query SELECT * FROM Student ORDER BY total_marks DESC LIMIT 1.
The SELECT statement in SQL is used to retrieve data from a database table.

Database Concepts

In the 'Student' table, the primary key 'sno' represents a unique identifier for each student.
The 'gross_salary' column in the 'Employee' table represents the total salary of an employee.

Data Sorting and Listing

When sorting a dataframe based on 'gross salary', the order of records will be arranged in ascending or descending order based on the salary values.
When listing out the top three records from a dataframe, the program will display the first three records in the sorted order.

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Description

Test your knowledge on selecting data from pandas DataFrames using head, tail, loc, and iloc methods. Practice selecting top and bottom records, specific conditions, and accessing specific data based on labels or positions.